We found one dictionary that defines the word galactic habitable zones:

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1. galactic habitable zones: Wiktionary

▸ Words similar to galactic habitable zones ▸ Usage examples for galactic habitable zones ▸ Idioms related to galactic habitable zones ▸ Wikipedia articles (New!) ▸ Words that often appear near galactic habitable zones ▸ Rhymes of galactic habitable zones ▸ Invented words related to galactic habitable zones